<template>
  <div id="userLoginPage">
    <div class="background-overlay">
      <div class="login-container">
        <h2 class="title">辅助学习系统 - 登录</h2>
        <a-form :model="formState" name="basic" autocomplete="off" @finish="handleSubmit">
          <a-form-item name="userAccount" :rules="[{ required: true, message: '请输入账号' }]">
            <a-input v-model:value="formState.userAccount" placeholder="请输入账号" />
          </a-form-item>
          <a-form-item
            name="userPassword"
            :rules="[
              { required: true, message: '请输入密码' },
              { min: 6, message: '密码不能小于 6 位' },
            ]"
          >
            <a-input-password v-model:value="formState.userPassword" placeholder="请输入密码" />
          </a-form-item>
          <a-form-item name="captchaInput" :rules="[{ required: true, message: '请输入验证码' }]">
            <a-row :gutter="[16, 0]">
              <a-col :span="14">
                <a-input v-model:value="formState.captchaInput" placeholder="请输入验证码" />
              </a-col>
              <a-col :span="10">
                <div
                  class="captcha-box"
                  @click="refreshCaptcha"
                >
                  {{ captchaText }}
                </div>
              </a-col>
            </a-row>
          </a-form-item>
          <div class="tips">
            没有账号？
            <RouterLink to="/user/register">去注册</RouterLink>
          </div>
          <a-form-item>
            <a-button type="primary" html-type="submit" style="width: 100%">登录</a-button>
          </a-form-item>
        </a-form>
      </div>
    </div>
  </div>
</template>

<script setup lang="ts">
import { reactive, ref } from 'vue'
import { useRouter } from 'vue-router'
import { useLoginUserStore } from '@/stores/useLoginUserStore'
import { message } from 'ant-design-vue'
import { userLoginUsingPost } from '@/api/userController'

const formState = reactive({
  userAccount: '',
  userPassword: '',
  captchaInput: ''
})

const captchaText = ref<string>(generateCaptcha())

function generateCaptcha() {
  // 简单的数学运算验证码
  const num1 = Math.floor(Math.random() * 10) + 1
  const num2 = Math.floor(Math.random() * 10) + 1
  return `${num1} + ${num2} = ?`
}

const router = useRouter()
const loginUserStore = useLoginUserStore()

function refreshCaptcha() {
  captchaText.value = generateCaptcha()
  formState.captchaInput = '' // 清空用户输入
}

/**
 * 提交表单
 * @param values
 */
const handleSubmit = async (values: any) => {
  const expectedAnswer = eval(captchaText.value.split('=')[0]) // 注意：eval存在安全风险，此处仅用于简单示例
  if (parseInt(values.captchaInput) !== expectedAnswer) {
    message.error('验证码错误')
    refreshCaptcha()
    return
  }

  // 假设这里进行登录操作...
  const res = await userLoginUsingPost(values)
  // 登录成功，把登录态保存到全局状态中
  if (res.data.code === 0 && res.data.data) {
    await loginUserStore.fetchLoginUser()
    message.success('登录成功')
    if (res.data.data.userRole === 'admin') {
      router.push({
        path: '/admin/home',
        replace: true
      })
    } else if (res.data.data.userRole === 'user') {
      router.push({
        path: '/user/home',
        replace: true
      })
    }
  } else {
    message.error('登录失败，' + res.data.message)
  }
}
</script>

<style scoped>
#userLoginPage {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #6e8efb, #a777e3);
}

.background-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.2);
  display: flex;
  justify-content: center;
  align-items: center;
}

.login-container {
  background-color: #fff;
  padding: 40px;
  border-radius: 8px;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
  width: 360px;
}

.title {
  text-align: center;
  margin-bottom: 24px;
  color: #333;
  font-size: 24px;
  font-weight: 600;
}

.tips {
  margin-bottom: 16px;
  color: #888;
  font-size: 13px;
  text-align: right;
}

.captcha-box {
  background-color: #f0f0f0;
  padding: 8px;
  text-align: center;
  cursor: pointer;
  border-radius: 4px;
  font-weight: 500;
}

a-form-item {
  margin-bottom: 20px;
}

a-button {
  height: 40px;
  font-size: 16px;
  border-radius: 4px;
}
</style>
